Avm.Authoring

0.5.0

Private/Tools/Invoke-AvmHttp.ps1

                                function Invoke-AvmHttp {

    <#

    .SYNOPSIS

        Download a URL to a local file, verifying SHA256 atomically.

    .DESCRIPTION

        The only download primitive used by the tool resolver. Pins TLS 1.2+,

        honours $env:AVM_OFFLINE=1 (refuses any HTTP), and rewrites the host

        when $env:AVM_MIRROR is set. Always writes to '<Destination>.partial'

        first, verifies SHA256, and only then renames to the final path.

        For test fixtures, file:// URLs are accepted and short-circuit the

        network path while still going through the SHA verification.

    .PARAMETER Url

        Source URL. Must start with https:// (or file:// for tests).

    .PARAMETER Destination

        Absolute path to write the downloaded artifact to.

    .PARAMETER ExpectedSha256

        64-char lowercase hex SHA256. A mismatch throws SecurityException and

        deletes the .partial file.

    .PARAMETER TimeoutSec

        Network read timeout (default 300s). Ignored for file:// URLs.

    #>

    [CmdletBinding()]

    [OutputType([string])]

    param(

        [Parameter(Mandatory)] [string] $Url,

        [Parameter(Mandatory)] [string] $Destination,

        [Parameter(Mandatory)] [string] $ExpectedSha256,

        [int] $TimeoutSec = 300

    )

    Set-StrictMode -Version 3.0

    $ErrorActionPreference = 'Stop'

    if (-not ($Url.StartsWith('https://') -or $Url.StartsWith('file://'))) {

        throw [System.ArgumentException]::new(

            "Invoke-AvmHttp only accepts https:// (or file:// for tests). Got: $Url")

    }

    if ($ExpectedSha256 -notmatch '^[0-9a-f]{64}$') {

        throw [System.ArgumentException]::new(

            "ExpectedSha256 must be 64-char lowercase hex. Got: $ExpectedSha256")

    }

    $mirror = if (Test-Path Env:\AVM_MIRROR) { $env:AVM_MIRROR } else { $null }

    $effectiveUrl = Resolve-AvmMirrorUrl -Source $Url -Mirror $mirror

    if ($effectiveUrl -cne $Url) {

        Write-AvmLog "AVM_MIRROR rewrite: $Url -> $effectiveUrl" -Level Verbose

    }

    $offline = if (Test-Path Env:\AVM_OFFLINE) { $env:AVM_OFFLINE -eq '1' } else { $false }

    if ($offline -and $effectiveUrl.StartsWith('https://')) {

        throw [AvmConfigurationException]::new(

            "AVM_OFFLINE=1: refusing to download $effectiveUrl")

    }

    $destDir = Split-Path -Parent $Destination

    if ($destDir -and -not (Test-Path $destDir)) {

        New-Item -ItemType Directory -Path $destDir -Force | Out-Null

    }

    $partial = "$Destination.partial"

    if (Test-Path -LiteralPath $partial) {

        Remove-Item -LiteralPath $partial -Force

    }

    if ($effectiveUrl.StartsWith('file://')) {

        $localSource = [Uri]::new($effectiveUrl).LocalPath

        Copy-Item -LiteralPath $localSource -Destination $partial -Force

    }

    else {

        # TLS 1.2+ pin. Tls13 may not be defined on older .NET targets, so

        # combine defensively.

        $tls12 = [System.Net.SecurityProtocolType]::Tls12

        $protocols = $tls12

        $tls13Member = [System.Net.SecurityProtocolType].GetField('Tls13')

        if ($null -ne $tls13Member) {

            $protocols = $tls12 -bor [System.Net.SecurityProtocolType]::Tls13

        }

        [System.Net.ServicePointManager]::SecurityProtocol = $protocols

        Invoke-WebRequest -Uri $effectiveUrl -OutFile $partial -TimeoutSec $TimeoutSec -UseBasicParsing | Out-Null

    }

    $actual = (Get-FileHash -LiteralPath $partial -Algorithm SHA256).Hash.ToLowerInvariant()

    $expected = $ExpectedSha256.ToLowerInvariant()

    if ($actual -ne $expected) {

        Remove-Item -LiteralPath $partial -Force -ErrorAction SilentlyContinue

        throw [AvmToolException]::new(

            "SHA256 mismatch downloading $effectiveUrl. Expected: $expected. Actual: $actual.",

            'AVM1011')

    }

    if (Test-Path -LiteralPath $Destination) {

        Remove-Item -LiteralPath $Destination -Force

    }

    Move-Item -LiteralPath $partial -Destination $Destination -Force

    return $Destination

}

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